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Estimating the Impact of Consecutive Blood Meals on Vector Competence of <i>Aedes albopictus</i> for Chikungunya Virus
oleh: Eva Veronesi, Anca Paslaru, Julia Ettlin, Damiana Ravasi, Eleonora Flacio, Matteo Tanadini, Valeria Guidi
Format: | Article |
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Diterbitkan: | MDPI AG 2023-06-01 |
Deskripsi
The continuous expansion of <i>Aedes albopictus</i> in Europe and the increases in autochthonous arboviruses transmissions in the region urge a better understanding of the virus transmission dynamic. Recent work described enhanced chikungunya virus (CHIKV) dissemination in <i>Aedes aegypti</i> mosquitoes exposed to a virus-free blood meal three days after their infection with CHIKV. Our study investigated the impact of a second blood meal on the vector competence of <i>Ae. albopictus</i> from southern Switzerland infected with CHIKV. Seven-day-old <i>Ae. albopictus</i> females were exposed to CHIKV-spiked blood and incubated at constant (27 °C) and fluctuating (14–28 °C) temperatures. Four days post-infection (dpi), some of these females were re-fed with a non-infectious blood meal. Virus infectivity, dissemination, transmission rate, and efficiency were investigated at seven and ten dpi. No enhanced dissemination rate was observed among females fed a second time; however, re-fed females have shown higher transmission efficiency than those fed only once after seven days post-infection and incubated under a fluctuating temperature regime. Vector competence for CHIKV was confirmed in <i>Ae. albopictus</i> from southern Switzerland. We did not observe an increase in dissemination rates among mosquitoes fed a second time (second blood meal), regardless of the temperature regime.